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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b61d4d83cf111b31b759be4e53a2a135f17cced4c73073261959daae071ba7dd' 
  AND token = '4gPkiQZdQlEgI2cMUoWve58Wap3nNBZQTmPLjr5f5Oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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