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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2925202ccc704742cd305af9bbedd47a0c6b88e4eb93041fc604d613ef759fa' 
  AND token = 'aRXApRNtcIWGK9grrHz6XMyhjhv4NUe3ZANg9mRSTzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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