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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ce1fb1f4920aa20af4df9a6bf9360e2d6a5cf004b0e83f6f9151aa4fade7feb' 
  AND token = 'n7yRoakDWUF/6UGADA7HEHxrfW+0AJtwFkTbg5IeWGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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