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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '48bfd3e22069690ea720334ebfa4d2649dfeb5c14c364cc6889e5c98efdb8e22' 
  AND token = '9AMXYGJcw0fnhSDprtk0srE8sMfGAniXQZfa/Pv1a4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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