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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7e3dbb04b15bc8a340c68570eb5d3456c4ad8aaca1fbeebd096b5759bef8837' 
  AND token = '05hvIYBb3kJXB4rrcUxFK+zNHVDGkkeTBHYOJywWVT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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