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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd95a6fe6c708554c51d610159b1d0fd1f94ddb5c4773a8fddf0d4e8a464d27c6' 
  AND token = '6TirsgN18hnRdAVNs+RZq7/EZYr4xzhs3fJI2FF2vMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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