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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6ff999876cf0a9bc2d174faab1bd479b3ae85578e18911870fc948d43122431' 
  AND token = 'sk9E6uDNgeCsdsZwSiWYNNcXl2/C1zMLX/UXTPE7Rpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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