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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '07d3b50880ebb39c500a1794ee95b86dcaa0c055ef377ffb57c7880aafb8dc13' 
  AND token = '0p6UDMoF/F3C+/PZEDwmKTNfv0UhjcTOYEXwQseLizk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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