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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'acc5feaea055fab083777973b63b900a358393af3a9b00555ade79d46280864c' 
  AND token = '8GiHiJTyS9G8P8EusKxbH20MFL9HIlzEg9WytGdZOCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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