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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea952b5a58ec58a20fe41c19da5e4a5ad1f940495537a0a3d7b157c77628be17' 
  AND token = 'mMFhWQoOsxnQ6xXpPqudj+ukyhds5225Orfiu8LOJwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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