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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b03b44e32a8393304eec6ab4e0a18a3288947db1a4611694e00456561d460ad7' 
  AND token = 'Nfz/9OsK94GyEK4NGw8XTDdJD9kfXugWFdqG5p5tTgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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