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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89a94e4e1eee15397770ec593ce5ca212c417b7b3769122b947d4c43f30b9f49' 
  AND token = 'q1rTFKwUej264rbzerN6w/2O4qEo4pyB+wVbMTjLw5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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