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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e8835395476ca33a9731e7bf3d6468b17a7c234bd045504b7e6ac84fd39504a' 
  AND token = 'RaWnrOzotYokgxtqaZ5IG+KMpY5+orwxoaTlbJ+3Hcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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