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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5992ae0e4ca5f883469657ccb3c279385ad19f015469201291e65ace265c1917' 
  AND token = 'zRLYJrhn/TnHb/yC2R6qiNq9q5ye4lqON0GiXwf0+KI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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