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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2f968908998e50dc497c9f8128e9cd3cfaca48119a75e928abddec7bd159a1e' 
  AND token = 'Ft4UvV8hko3l6RgojKmQchuWAYwNS6K0a1yKCqvl6+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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