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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c17e723cba1bbfd82254e9a70e23767310ac8b9be76d6e4ebda082bb0bbed245' 
  AND token = 'jRY1CG4DcWM+GA9MVTp/6RjeHyQBEdLIOQpk8a+Bg+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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