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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '301b7742c3f2372f2133b51d1d8fac56a4bbb28e4244cf41448d2c3ca6bb903c' 
  AND token = '/vsn7dpydOVA2HiosY+ogA2smfMqwrKukAlb8+IuUnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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