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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a7ee3c43f56e8f8590b6660a542806b851c5bbfe3b2286205b91db514d7ed3f' 
  AND token = 'VuJ7YGhk44kvSIUIzbZaWILQVkHrd75+drITUzM8CbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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