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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb5d94695267f823e4cdb5970c2da3379ff3418da3323abd3597ca996f290f4b' 
  AND token = 'lFODHJ7risRo+rtQTTt7pMhQQ8VyMnnus273pEJxVQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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