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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b74513b5cb0148568bf3c3b4721b73ba714108312d85560f23889ce80edf49e2' 
  AND token = 'GHGQij22t3xsZ/S3EtTfSa3n1RrcZUIJL9wkpt4RQiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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