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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd34ae1a8512760558a398531180db9f7454af8fa1028ea86caaa4792b521ac01' 
  AND token = 'QcNvZCnL/8SXifiQI+flX17APPF7ZNua/+uYN7ty0XM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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