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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a3e0265ce7a39ebe0ae26e315734c3dd02fd4bf58d774850193ef9d2556b3c0c' 
  AND token = '74L0EZFsftb0nFY7Wv/8voaBsmIW4r2anewicwLqcjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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