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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5d80053c3d1afbaa81a48d3ad9d8486a228425b95af7e2cb23de426ac97d3dc' 
  AND token = 'crn6udqYbfnWu0VoYny4iY4Ifro1zFTXMLcp+T0D/P0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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