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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed31e0e470aa8f95cd2ca1dafe9a83b4be4b8d722d5c1bf92eed2b9d31521fd9' 
  AND token = 'Jg3/pkXSDG0+z2jtkumkn3gj5YOXGdcgDS2Sqq8KkS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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