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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '797e89646bc755bc50b2a52f30b0ff3d4202827a4e44b25eeece0a70c73cf4ab' 
  AND token = 'Zfg2GYgZKkiTW5y+2bb1j+SX9P0uc0zbpwKXWe7JuiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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