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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0e9b4acd84454e691b105aa2d6b428f7132ea64f68c41620521ee783284230c' 
  AND token = 'UD8zS7VvtcmfyuNPvwavesMIEg8YKm2it9R1h4HUxCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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