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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1213acf8491cea0339e27d2bb5300d7a794879b0a57cb2437338427c5b9ad6aa' 
  AND token = 'S/nI0fJjuhYknq7TnRn5PJNODZ3mZpdlGNDz5SUQ1EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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