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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2929739a7820e1e28116068f1533fcb961a96e624a06150e5afdfed4a792e23' 
  AND token = 'XH18tU86cfa+YqP9eSKGmRuw9Yv/937TwyiO3b2xVCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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