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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66a481c59e480007b43bfa09ac437a6894237e948cb614ad24289bd572f4c49c' 
  AND token = 'Deq7Iget/zO4lV8ifs0ldm8avErylTWGFzA4CSIXL48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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