SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '422f7b33433861c30f1393d8bde39c90ea54736bc4ee68d3133c8343259a1486' 
  AND token = 'DoUXu63MtdNdhNwF4wHKT2VQ9KBv+fZmTSGqf+ODtB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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