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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b05be58bc3b65705738d6d056afb87b23e7db31cb6deb24f19f0b6904a36d387' 
  AND token = '+heuz3nvlZg9VQLpm1xO3orD66Rt6zw5bNulDlX9Dm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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