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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3d4a81c04686fedea952ce807cd5cfdda231d38cded35364ed9959e58564e0f' 
  AND token = 'nA/ffFr4OnuJkSZitUvHcZVC01fbAjorvyXmhsCGoPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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