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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff7964ee31fa19ae5008db9a1495b354f697c91fc4193dab2ce34c78ee1384da' 
  AND token = '2XEE8SKLZ+7q9iS5lPdLendZTlYSDQqFSzXwWsxspNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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