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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd96ead0923e4fb14ee173cde20d2e3657c91ec15d5c0214f3e16fb34cd65b577' 
  AND token = 'hVFXbZ7X0e+lspu/yrNkgX/8ZisI9krKDfYQo3DYa6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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