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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4fb7f7cd349f857f64933c9424bbbb9bb9ecf9e7dab64031ad6d477b5f5bd7e3' 
  AND token = 'GOQUZb9y4hZ5S3pY4HOuD+u4eOy8NHXfNcktvU4qe3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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