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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c21c87475f616d31d57c3a476faba4163210202ae9fccefcfa6d2c8afcc02f9' 
  AND token = 'L0PBlgE2qw2PBKZUAWgMvMNKqxPL2Nx8octRv2cv/Zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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