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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3f09e5aa6181ab25bd7dc3c8e0e306358fc23879f01c394bc2b36c4fdf3aefe' 
  AND token = '6c84htg4ebQLqRMo9kFBNtNVtMVCBBk/3PRYrb823aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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