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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1732d957237aed972c5bdffc134fc832001357d34913325cee7109bde6e60a9b' 
  AND token = 'WaHMB4d8NkSgvkqAXBMsK5vc6qYjSNdt7kcI+TMSqD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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