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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36ebb5d58aafec3ccab49658f801702320eeadfdae54d1dd81fafd1b62312bcd' 
  AND token = '4aIaRSv8rx+quN3/GJPW02PJ0JugOLpr3BF1NWX4Cxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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