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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fcae765ba4f018854c641ec496f76143204d040e473b134b3b187ebd0ccffdee' 
  AND token = '0wGwUO13lVS87SrRi7jXwDNlkOQPRWjqtOccdJ/lSlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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