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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d023435cfb3ccd09ec799400b0bbed835535bd8cb355143ae313c140832e961' 
  AND token = 'usHvU/mLt/6a67xX7hxcZyiY9/yYYYguB56kVg5Ar8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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