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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1740af714ccf03ac02fe5283b7d9e60749c2a34c563eb88cd98dfdaef347c0d' 
  AND token = 'oWWysLQTy59i0jGv1ayPw03oy6u9EXP2H7vWE2FVXWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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