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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d604c98c5bfafe6ab00b8992a7f97b5d58ba63e7f0aa56aa205340172c4ff0b' 
  AND token = 'so1dNJVPq8mISeC1eSygQGvhV2d4ZYqc9VWmV9Xx0ZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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