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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a5463662de0f3548713005caebcd11117c7dab2f6dd159cb1087b333437506e' 
  AND token = 'Y9PdETswe0+DZUGNMSat6Ou9T7nkcrBwbolLjM6FUyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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