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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'efccb9a4ee7a91f73975301f9803bbd5a8f4a9f7a3e317f746e5568db5fa6901' 
  AND token = 'qThISc1R8T2R/YdzLSAlqYncvoQIkreXbRo9bEcMZ5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}